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Bank Loans (Risk Category Of Loan Portfolio) (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | $ 20,532,967 | $ 20,602,558
Pass [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 20,258,507 | 20,427,527
Special Mention [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 78,007 | 108,027
Substandard [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 186,517 | 56,899
Doubtful [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 9,936 | 10,105
Residential Real Estate [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 7,708,506 | 7,371,671
Residential Real Estate [Member] | Pass [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 7,706,547 | 7,370,717
Residential Real Estate [Member] | Special Mention [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 312 | 266
Residential Real Estate [Member] | Substandard [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 927 |
Residential Real Estate [Member] | Doubtful [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 720 | 688
Commercial and Industrial [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 4,471,031 | 4,897,176
Commercial and Industrial [Member] | Pass [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 4,298,705 | 4,743,290
Commercial and Industrial [Member] | Special Mention [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 17,619 | 87,761
Commercial and Industrial [Member] | Substandard [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 145,824 | 56,899
Commercial and Industrial [Member] | Doubtful [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 8,883 | 9,226
Fund Banking [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 4,349,541 | 4,182,641
Fund Banking [Member] | Pass [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 4,349,541 | 4,182,641
Securities-Based Loans [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 2,399,328 | 2,724,551
Securities-Based Loans [Member] | Pass [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 2,399,325 | 2,724,548
Securities-Based Loans [Member] | Special Mention [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 0 |
Securities-Based Loans [Member] | Substandard [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 0 |
Securities-Based Loans [Member] | Doubtful [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 3 | 3
Commercial Real Estate [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 677,521 | 675,599
Commercial Real Estate [Member] | Pass [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 577,777 | 655,599
Commercial Real Estate [Member] | Special Mention [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 60,000 | 20,000
Commercial Real Estate [Member] | Substandard [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 39,744 |
Commercial Real Estate [Member] | Doubtful [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 0 |
Construction And Land [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 772,571 | 593,191
Construction And Land [Member] | Pass [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 772,571 | 593,191
Construction And Land [Member] | Special Mention [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 0 |
Construction And Land [Member] | Substandard [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 0 |
Construction And Land [Member] | Doubtful [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 0 |
Home Equity Lines Of Credit [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 110,766 | 107,136
Home Equity Lines Of Credit [Member] | Pass [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 110,369 | 106,954
Home Equity Lines Of Credit [Member] | Special Mention [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 65 |
Home Equity Lines Of Credit [Member] | Substandard [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 22 |
Home Equity Lines Of Credit [Member] | Doubtful [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 310 | 182
Other [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 43,703 | 50,593
Other [Member] | Pass [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 43,672 | 50,587
Other [Member] | Special Mention [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 11 |
Other [Member] | Substandard [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | 0 |
Other [Member] | Doubtful [Member] |  |
Financing Receivable Recorded Investment [Line Items] |  |
Gross bank loans | $ 20 | $ 6

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